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Abstract

The use of satellite remote sensing images could be a valid alternative to the classical methods of bathymetric
measurements for depths less than 30 meters. In this work, several pixels corresponding to different depths are
considered to numerically evaluate the relation between the water spectral response and the real depth, in the Douro
River Estuary (Porto, Portugal). The main concept relies on principal components analysis, which allows for combining
the information of the n available spectral bands from the image into an equal number n of principal components. The
dataset is composed by an IKONOS-2 image and bathymetric values. An initial analysis was performed in order to
determine the viability of the data for bathymetric study of the Douro River estuary. It was proved that it was not
possible to find any direct relationship between the DNs of the IKONOS-2 image and depth values. Therefore, a simple
linear regression of the bathymetric values on the IKONOS-2 image principal components was considered. A significant
correlation was found between the first principal component and the real depths. In the future, the use of simultaneous
data and the use of other statistical models such as decision trees may also provide important contributes to improve this methodology.

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Journal of Applied Remote SensingJournal of Astronomical Telescopes Instruments and SystemsJournal of Biomedical OpticsJournal of Electronic ImagingJournal of Medical ImagingJournal of Micro/Nanolithography, MEMS, and MOEMSJournal of NanophotonicsJournal of Photonics for EnergyNeurophotonicsOptical EngineeringSPIE Reviews